III. Thinking as the Instrument of Knowledge

I have so far spoken of thinking without taking account of its vehicle, the human consciousness. Most present-day philosophers would object that before there can be thinking, there must be consciousness. Hence we ought to start, not from thinking, but from consciousness. There is no thinking, they say, without consciousness. In reply I would urge that, in order to clear up the relation between thinking and consciousness, I must think about it. Hence I presuppose thinking. One might, it is true, retort that, though a philosopher who wishes to understand consciousness, naturally makes use of thinking, and so far presupposes it; in the ordinary course of life, however, thinking arises within consciousness and, therefore, presupposes that.